Nervous System Diseases
The word, ‘Nervous system’ includes: —
- Spinal cord
The brain is the organ of mind that enables us to know, feel and will. Brain coverings are called meninges.
The nervous system of man is Cerebro-Spinal and Sympathetic. The Cerebro-Spinal system comprises—
- Brain (the upper part of which is called cerebrum and the lower, cerebellum),
- Medulla Oblongata,
- Spinal Cord.
The spinal cord, on both sides of the body issues pairs of nerves that ultimately distribute themselves to muscles, skin and glands. The cerebrum or the great brain is concerned with functions of knowing, feeling and willing. The cerebellum or little brain is concerned to maintain the equilibrium of the body. The medulla oblongata holds the key to circulation, respiration, vomiting and regulation of blood-supply to different parts of the body. The spinal nerves are conductive (i.e., they move muscles), sensory and trophic (i.e., they are concerned in maintaining nutrition) in function.
The sympathetic nervous system supplies the internal organs and is concerned chiefly with regulating the blood supply to organs and tissues. As the sympathetic system is full of knot-like swellings, it is known as gangliated (knotted) system.